Kiriko Nio, the beautiful girl who spent her youth as the masked heroine Himeshima Ageha, has long upheld her role as a teacher. But after decades, she retrieves her hidden transformation compact and becomes Fontaine once more, renewing her resolve to fight. Yet whenever she recalls the rape she suffered years ago while still dressed in her Fontaine costume, her body helplessly grows hot with arousal. Trying to calm herself, she masturbates to relieve the feverish tension. The evil organization Badess, having suffered major losses due to the magical mature warrior Fontaine interfering with their operations, decides to strike back by kidnapping Ageha's beloved son. Fontaine rushes to the villains' hideout, but struggles against the overwhelming power of the monster Makugan. After a fierce battle ending in mutual collapse, she loses consciousness. When she awakens, she finds herself restrained—and the male students who appear before her are her own former pupils. Her son is right there, being raped by the students, then forced to lick her genitals as she writhes and climaxes helplessly.